5 doctors weighed in

The body continuously recycles & replaces different cells in the blood.

Red cells last ~100days, platelets several hours, other cells vary. The healthy system acheives a steady state of producing cells as fast as they break down. If an event such as a toxic exposure (chloramphenacol) or tumor invasion shuts down the "factory", no new material will be made & you get low on everything.

In brief:
Production stops

The body continuously recycles & replaces different cells in the blood.

Red cells last ~100days, platelets several hours, other cells vary. The healthy system acheives a steady state of producing cells as fast as they break down. If an event such as a toxic exposure (chloramphenacol) or tumor invasion shuts down the "factory", no new material will be made & you get low on everything.
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